Posted by **Anonymous** on Sunday, November 7, 2010 at 1:27pm.

Volunteers who had developed a cold within the previous 24 hours were randomized to take either zinc or placebo lozenges every 2 to 3 hours until their cold symptoms were gone. Twenty-five participants took zinc lozenges, and 23 participants took placebo lozenges. The mean overall duration of symptoms for the zinc lozenge group was x1 = 4.4 days, and the standard deviation of overall duration of symptoms was 1.6 days. For the placebo group, the mean overall duration of symptoms was x2 = 8.1 days, and the standard deviation was 1.5 days. Compute a 95% confidence interval for the difference in mean days of overall symptoms for the placebo and zinc lozenge treatments. Use the unpooled standard error and use the smaller of n1 - 1 and n2 - 1 as a conservative estimate of degrees of freedom. (Round the answers to one decimal place.)

3 to 4 days

- math -
**tom**, Monday, November 30, 2015 at 3:24pm
yes

## Answer This Question

## Related Questions

- English - Posted by rfvv on Thursday, December 9, 2010 at 11:58pm. Posted by ...
- English - Posted by rfvv on Thursday, December 9, 2010 at 10:03pm. 1. We had to ...
- English - 1. I made up my mind to go there. 2. I decided to go there. 3. I ...
- math statistics - Marathon runners were randomly assigned to receive either ...
- math statistics - Marathon runners were randomly assigned to receive either ...
- math - if tony took 24 hours to finish his homework and sally took 30 hours. if ...
- xiamen university - The probability that a person catches a cold during the cold...
- English - 1. How long did it take for him to finish the 200-kilometer course? 2...
- algebra - -If A and B are two different numbers selected from the first thirty ...
- Math grade 5-6 - Alice works part-time after school. On Monday, Alice records ...

More Related Questions